The Team That Started In Alien Force

When Ben took over the Omnitrix again, he needed the help of his cousin Gwen Tennyson. They were going to find their Grandpa Max Tennyson, when they found a smuggling deal going on with the Forever Knights. Ben decided to put his new Omnitrix to the test. His first transformation was the alien Swampfire. Swampfire has the ability to throw balls of fire at opponents, along with controlling plant life. Wanting revenge, Kevin 11 decided to take on Ben. One-on-One. Kevin could defeat him when they were kids, but now Ben is the one who is the victor. Kevin decided to join Ben and Gwen in becoming a plumber, like his dad, but he also wanted to date Ben's cousin, Gwen. Gwen and Kevin share a love/hate relationship with each other. At the end of Alien Force, Gwen and Kevin share their first kiss, which starts their boyfriend/girlfriend relationship. They protect the earth and galaxy, and became the best plumbers in the universe.